I have no familiarity with LabVIEW, but here are the button id's.
Code:
/** XBOX Controller Notes
* Buttons:
* A=1
* B=2
* X=3
* Y=4
* LB=5
* RB=6
* Back=7
* Start=8
* LeftAnalog=9
* RightAnalog=10
* Axis:
* LeftX=1
* LeftY=2
* RightX=4
* RightY=5
* Trigger=3 (Left moves -, Right moves +)
*/